Manufacture of incandescent lamps



(No-Model.)

, A. SWAN. v MANUFACTURE OPINGANDESCTENT LAMPS.

No. 282,472. Pat'ented Ju ly 31,1883.

Fig.1.

a pmwun n wfwunm mm o. c.

UNITED, STATES PATENT OFFICE.-

ALFRED swAN, or'eA'rEsnEAD, COUNTY or *DUBHAM, ENGLAND.

MANUFACTURE OF INCANDESCENT LAMPS.

SPECIFICATION forming part of Letters Patent No. 282,472, dated July, e1, 1883. 7 Application filed J uue 9, 1883. (No model.) Patented in England November 20, 1882, No. 5,504.

To all whom it may concern:

Be it known that I, ALFRED SWAN, a subject of the Queen of Great Britain, and residing at the borough of Gateshead, county of Durham, England, have invented certain Improvements in the Manufacture of Incandescent Lamps, (for which I have obtained a patent in Great Britain, No. 5,504, dated November 20,1882 of the glass or the like and the terminal wires which the following is a specification.

My invention relates to the manufacture of incandescent electric lamps, and has for its obj ect to give a more complete adhesion between electric current through the wires at the same time that the-glass or the like is being pressed around them. This may be effected in any,

convenient or suitable way. When, for ex ample, the stems are being cast in molds, as described in the specification of my Patent No. 263,621, dated August 29, 1882, I may insulateportions of the metal of the said molds, so as to lead the current -.wires up to and through the wires which are to be embedded in the stem. V

Figure 1 represents an opened-out mold constructed with an insulating portion, for the purpose of carrying my invention into effect; and Fig. 2 is a transverse section on the line 1. 2,

' Fig.1. I

The part marked a (in which the recesses in which the glass is cast are made) is. of a non conducting material or comparatively non conducting material.

b are studs, pins, or pegs on one half of the mold, over which the loops of the terminal wirepass, the said wire being also passed over a stud, pin, or peg, 0, formed upon a plate, a,

screwed or otherwise secured to the material a. The pegs b arejcarried to the exterior of the casing of the mold, being surrounded by electricity is passed through the terminal wires at the same time that the glass is passed around them, whereby very complete adhesion of'the glass to the wires is obtained.

when the mold is put in place, a current of l d are pegs for retaining the wires in proper position. I

Fig. 3 represents an opened-out mold, and Fig. 4c a section on the line 3 4, Fig. 3, in. which mold the pegs b lin the one half of the mold and the recessesb in the other half,

'into'which thesaid pegs fit when the mold is closed, are surrounded by insulating material, as shown at a. The pegs b are continued to .the exterior of the mold for connection to the source of electricity, as hereinbefore described.

I do not limit myself to any particular form of the molds, nor of the recesses therein for the reception of the glass; and the said molds may be constructed of any suitable material, provided that insulation isprovidedfor the purpose of directing an electrical current through the wires during the embedding of the wires in glass or the like.

I claim- V 1. The improvements in the manufacture of incandescent electric lamps, consisting in pass ing an electric current. through the terminal wire while the glass or the like is being pressed or formed around it, substantiallyas hereinbeforedescribed.

2. In the manufacture of incandescent electric lamps, the employment, of molds for form- 'ing the glass portions through which the ter- ALFRED SWAN. Witnesses:

RoBT. Srn'non WATSON,

Solicitor, Newcastle-upon-Tyne. ROBERT LOGKEY, Clerk to Messrs. Watson & Dandy, Solicitors, New:

castle-upon-lfz ne. 

